Relay.



P. MAcGAHAN'.

RELAY;

' APPLICATION manja uus 11 m5.

1 $27,469. Pate ted May 22',- 1917.

' CURRENT F/qi WITNESSES: INVENTQR TIME UNITED STATES PATENT OFFICE.

PAUL MAeu nAN, or P TTSBURGH; PENNSYLVANIA, ASSIGNOR To WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

RELAY.

To 117/ Ir/Im/i-iz may conwrn:

Be. it known that 1. PAUL MACGA'I-I N, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in following is a speciis-a diagrammatic .yiew of a relay embody ing my invention. and Figs. 2. 3 and -.l are diagrams illustrating tiine-element characteristics that may be obtainedby a relay embodying my invention.

A circuit 1 is provided'with a circuit interrupter-2 and a current transformer 3. relay -1 is provided for tripping the circuit interrupter Q a: time interval after the current that traverses the circuit 1 has increased to a predetermined value.

The relay-lcomprises two rotatable disksorarmature members 5 and 6. a magnetizable core member T for the armature a main winding 8 and an auxiliary winding 9 for ment.

Specification of Letters Patent. e Patented )[ay 22, 1 9171 1915. Serial No. 33,489.

stantially instantaneously, while the other mayeither operate after a lapseofa definite time interval or after a time that is inversely proportional to the current traversingthe circuit. However, it will be understood that the armature 5 need not'necessarily be provided with 'a damping magnet 20. v

"hen a predetermined current-traverses the circuit 1. the armature 5 rotates and, it the spring 13 is sufliciently strong, the armature i) will also be rotated. Since the movement of the armature 6 is:.damped by the magnet 10. the whole system will rotate in a time that is inversely proportional to the strength of the current traversing the circuit 1. to cause engagement of the contact members ll and 15 and thus-trip the circuit interrupter 2. I

It the spring 13' is relatively weak and a predetermined current traverses the circuit 1. the armature 5 will rotate substantially instantaneously but. because of- ,the 'weakness of the spring 13 and the retarding eti'ect ot' the magnet 10. the :rmature 6' will require a definite time tocodiplete its move- Thus, afte a lapse of a definite inthe magnetizable member Tand permanent.;.; f bf tllnothe Contact e s 1 and 5 and G are connected together by a springmovable contact member let is mounted upon the shaft 12 and adapted to engage a stationary contact member 15. The con tact members 1-1 and 15 constitute the sep-'- arabletern'iinals of a. circuit -16 that comprises a. battery 17 and the winding 18 of the] tripping electromagnet 19 of the circuit interrupter Q. The winding 8 is connected to the secondary winding of the current transformer 3 for the purpose of actuating the armature 5 in accordance withthe current traversing the circuit 1, While it is here shown that the armature- 5 is actuated in accordance with the current traVersing the circuit 1, it wilhof course, be undefdamping magnets 10 and 20 for the a1'1'na-,.. r13 will be g g to r p C tni'es (i and respectively; The shafts 11-1 and 12 of the respective armature membersij .substantially definite time-element characteristic at other overloads. i

It will be understood that the relay, as here shown, is .purely diagrammatic and that many modifications may be made therein without departing from' the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. A relay for an electric circuit comprising an actuated member, a retarded member and means connected therebetween whereby the retarded member is adapted to operate ina time that varies substantiallyinversely as thecurrent traversing the circuit up to a predetermined value of current and in a definite time for all values of current above the predetermined value. I

2. A. relay'foran ing an actuated member, a retarded member and a' resilient means connected :therebetween whereby the retarded member is adapted to operate in a' time that varies substantially inverselyas the current traversing the circuit upto a predetermined value 1 of current and in a definite time for all valcurrent traversing -ues' of current above the predetermined 'value., Y

'3. A- relay for an electric circuit comprising an actuated member, a retarded member and a spring operatively connected therebetween' whereby the retarded member is adapted tooperate in a time inversely as the the circuit up to a predetermined value of current and in a definite time for all values of current above the predetermined value. 4.-A relay comprising a movable member, means for actuating the same, a retarded member and a spring operatively connected between the said movable and re-' tarded members said spring being soproportioned that it causesthe retarded memher to be actuated in accordance with the movement of the movable member under predeterminedconditions and to be actuated disproportionately to the movement of the movable member under other conditions.-

5. A-relay for an electric circuit comprising' a. main and an auxiliary armature, means for actuating the main armature .111 accordance \vlth' the current travers ng the circuit, means for retarding the operation-0f the auxiliary armature and means for so electric circuit c0mpris-.

between the said movable and connecting the-two armatures that the auxiliary armature is adapted to move in accordance with the main armature up to a predetermined value of current traversing the circuit and to move with a substantially constant speed'for all other values of current,

6. In a relay for an electric circuit, the comlnnatmnwith means actuated in accordance with the currenttraversmg the circuit, of a retardedcontact device, and means for so connecting the said actuated means and traversing the circuit under predetermined conditions and to have a definite time ot'v operation under other conditions.

7 8. A relay comprising a movable member means for actuating the same, a retarded member and a spring oper-ativel v connected reta lfded members, said spring being so proportimied that it causes the retarded member to be actuated in accordance with the speed of the ,movable member under predetermined conditions an'd to have a definite speed under other conditions. v

In testimony whereof, I have hereunto subscribed my name this 27th day of May PATTL in oiirtx.

eondicontact 

